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Message: [QUOTE="KTM Mike, post: 1084231, member: 22658"] I have an 05 250 exc which was running this jetting: 160 main, 38 pilot, A/S 1.25 out, N3EH needle, -3 clip Set up like this, it was a tad rich, not bad, moderate spooge. Did not foul plugs. I recently installed a EE pipe, which seemed to lean it out quite a bit - or else something by coincidence at that exact same time happened. A large part of my concern is ZERO spooge. I mean NOTHIN...ZILCH. I have always felt more comfortable with at least some spooge, so am rather uneasy with nothing. Should I worry? More back ground info - Prior to EE pipe, bike Ran well. EE pipe bike still ran great - no issues. I put EE pipe on the bike when it had oh, 120 hours or so on the clock. I immediately noticed the spooge went away at the first ride with the EE pipe. Bike has ran fine for a few hundred miles now with the EE pipe on it. maybe a bit hotter it seemed to before, and maybe felt a bit lean. It runs rather crisp - not a burble anywhere. I rode it a 200 miles or so, did not check plug (never thought of it actually). After a recent race, I did pull plug to discover it being rather white - one half was slightly darker though. I just did a top end on the bike - no signs of running lean on cylinder or piston (piston was worn looking though at 135 hours - but not a "oh my, this engine is about to sieze!) Cylinder still had cross hatch visible everywhere. Anyhow, after this rebuild, I decided I should richen it up a hair given how the plug looked before, so I lowerd the clip one notch (raised needle). AS to 1 out. did a 40 mile ride - some faster trail, 3rd gear, 4th gear occasionally. Pulled plug - a light oily black, not at all dry carbony look. Bike felt good, but I would say still kinda feels lean, and once again, seemed to be running hotter than normal. This plug read was not a throttle chop however...and this read showed richer than the other two noted here. Tonight I upped the main to a 162. (Was 160 before.). All other jetting exact same as noted before. I left the clip in -4 position for this little test. As it turned out, I did not have a 40 pilot to try..so that was left at the 38. Rode the bike about 1 .5 miles on a grass track to get it warmed up. Did a couple wider throttle positions straights, then did a oh, 3 or 4/10 mile blast top gear throttle pretty much wide open...the throttle chop, and killed the engine. Pulled plug - just like before if not slightly leaner looking - appears way to lean to me...greyish white is, one half of electrode slightly darker. Absolutely EVERYTHING about this plug reads "danger Will Robinson...to lean". I did notice the bike smelling hotter than I think it normally does (and when i think about it, some riding buddies over the weekend made a similar comment). I had a BR7ES plug in it, decided to pop in a BR8ES - did a repeat of above...same result, if not looking worse. VERY white tip, or if not white, ashy grey. Electrode ashy grey. Through all this bike still seems to be running great though. If anything the 162 main makes it pull a bit harder than before when whacking the throttle open. Now I am thinking about air entering the system from places we dont like it to...as in a left main?? How to check that??...take off side cover spray some WD-40 behind the flywheel? My next jetting specific thing will be raising the needle yet another step... (but my neighbors are gonna get mad if i do it now..so that will wait for tomorrow.) HELP! The Loose Moose is just 5 days away...gotta have the bike running properly by then! [/QUOTE]

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